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High-Performance Power ICs and Hall-Effect Sensors
Dual Full-Bridge Motor Driver IC
January 18, 1995 - Allegro MicroSystems has introduced a new motor driver integrated circuit, the 2919, which can be used for driving both windings of a bipolar stepper motor or for the bi-directional control of two DC motors. The 2919 is a dual full-bridge circuit, with both bridges capable of sustaining 45 V. The bridges use pulse width modulation (PWM) to give up to 750 mA of continuous output current, and the outputs are optimized for a low output saturation voltage drop (less than 1.8 V total source plus sink at 500 mA).
For PWM current control, the maximum output current is determined by the user's selection of a reference voltage and sensing resistor. Two logic-level inputs are used to select output current limits of 0%, 41%, 67% or 100% of the maximum level, and a phase input to each bridge determines the direction of the load current. The bridges include both ground clamp and flyback diodes for protection against inductive transients, while internally generated delays prevent crossover currents when the current direction is being switched. There is no need for special power-up sequencing, and thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits.
The 2919 is available in two versions: the A2919SB is supplied in a 24-pin dual in-line plastic "batwing" package with a copper lead frame and heat-sinkable tabs, while the A2919SLB is supplied in a 24-lead surface-mount SOIC package.
Allegro Microsystems, Inc. serves major automotive, industrial and computer peripheral customers with its growing line of mixed-signal (analog/digital) products. Allegro specializes in developing system-level solutions that integrate proprietary combinations of bipolar, CMOS and DMOS structures into a single, monolithic integrated circuit.